Final answer:
Pellagra is a niacin deficiency disease that can have serious consequences if untreated.
Explanation:
Pellagra is a niacin deficiency disease characterized by the '3 Ds' - Dermatitis, Diarrhoea, and Dementia. If left untreated, it can lead to the fourth 'D,' which is death. Niacin deficiency can result in symptoms such as nausea, anemia, headaches, and tiredness.
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